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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines Over Voltage (Protective Function 59) Primary Over Voltage Trip The Primary Over Voltage is adjustable from 528 VL-L down to the Under Voltage set point. (Default = 524V). The time period is adjustable from 0.3 to 10.00 seconds in 0.01 second increments. (Default = 1.90 seconds) The UL1741 requirement for this function is: Thedeviceshouldceasetoenergizetheoutputwithin2secondswhenanyof the phase voltages is higher than 305 VL-N while the other phase voltages remain at 277 VL-N As shipped, each Power Controller is tested to verify that it meets the UL1741 requirement to initiate a Grid Fault Shutdown if any phase voltage swells to greater than 305 VL-N for duration greater than 2.0 seconds. The primary trip voltage set point may be adjusted downwards within the range indicated in Table 2 and still comply with UL1741. The primary duration to trip may also be adjusted downwards as indicated in Table 2 and still comply with UL1741. Fast Over Voltage Trip The Fast Over Voltage is adjustable from the Over Voltage up to 634 Volts. (Default = 600V). The time period is adjustable from 0.03 to 1.000 second in 0.001 second increments. (Default = 0.032 seconds). The UL1741 requirement for this function is: Thedeviceshouldceasetoenergizetheoutputwithin2cycleswhenanyof the phase voltages is higher than 374 VL-N while the other phase voltages remain at 277 VL-N As shipped, each Power Controller is tested to verify that it meets the UL1741 requirement to cease power export to the grid within 33 ms if any phase voltage swells to 374 VL-N . If the grid voltage re-stabilizes to a level between the Primary Under Voltage trip and the Primary Over Voltage Trip levels within 1.0 second of the initial Fast Over Voltage event, then the Power Controller will resume power export to the grid, otherwise a Grid Fault Shutdown is initiated. The Fast Over Voltage Trip level may be adjusted downwards as indicated in Table 2 and still comply with UL1741. The duration to Fast Over Voltage Trip may also be adjusted downwards as indicated in Table 2 and still comply with UL1741. These Over Voltage protective functions are illustrated in Figure 3. The over voltage trips are programmed into the Power Controller as phase-to-phase voltages. Voltages indicated in Figure 3 are phase-to-phase voltages. However, the actual trip functions are based on phase-to-neutral voltages with equivalent trip levels. 410033 Rev. D (February 2006) Page 6 of 10 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Protective Relay Functions for Capstone MicroTurbines
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